JPS5845507Y2 - micro motor - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to the structure of a micromotor.

In recent years, anisotropic ferrite magnets with a large amount of magnetic flux have attracted attention as permanent magnets, and the yoke member to which these anisotropic ferrite magnets are attached needs to be thick to prevent magnetic saturation due to the large amount of magnetic flux. Therefore, unlike conventional motor cases, it cannot be formed by deep drawing a thin plate, and it is also impossible to provide a cut and raised piece on a thick yoke member to attach the magnet.

In view of these points, the present invention aims to provide a micromotor that has a simple structure and is easy to assemble.

An embodiment of the present invention will be described below based on the drawings.1.
2 is a pair of resin brackets, one of which 1 inserts and holds a self-aligning bearing 3 into a bottom recess la (see Fig. 2) by pressing it with a chrysanthemum-shaped pressing member 4, and the other 2 has a bottom surface. Recess (second
(See figure) A sleeve bearing 5 is press-fitted into 2a.

In addition, a pair of brushes 6.6 are provided on the inner surface of the other bracket 2.
Each terminal piece 6a is press-fitted and fixed together with the wedge 7.

Each bracket 1, 2 has an annular projecting wall 1b, 2b, respectively,
Each annular projecting wall has a pair of anisotropic ferrite magnets 8, 8 having cutout portions 1c, 2c for positioning their ends at opposing positions, and peripheral flanges 1d, 2d of each bracket 1, 2. A pair of substantially C-shaped thick yoke plates 9, 9 are provided with engagement grooves 1e, 2e on both ends of the protrusions 9a, 9a.

Further, on the surface of the annular projecting wall 1b between the notches 1c and 1c provided in the annular projecting wall 16 of one bracket 1, a yoke plate 9.9 is provided.
Latching protrusions 1f, if are provided to fit into the fitting holes 9b, 9b formed at one end of the holder.

Annular projecting wall 2 between the notches 2c and 2c of the other bracket 2
On the b side, there is an elastic claw piece 2f that engages with the retaining hole 9c provided on the other end side of each yoke plate 9, and the root part of the elastic claw piece has a shape on the other end of each yoke plate 9. A pair of grooves 9a, 9a provided
Support protrusion 2g that fits into.

2g is provided.

On the other hand, the end pieces 9e, 9e in a row between the grooves 9d, 9a of each yoke plate 9 are caulked with a punch, and the end pieces 9e, 9e are expanded as shown in FIG. Piece 9°, 9
8 is pressed against the husband support projections 2□ and 2g.

In the figure, reference numeral 10 denotes a rotor having a rotating shaft 11.

As described above, according to the present invention, the movement of each yoke plate 9.9 in the direction of the rotating shaft 11 with respect to each bracket 1, 2 is limited to the fitting holes 9b, 9b of each yoke plate 9, 9. Latching protrusion 1 f of brackets 1 and 2.

1f and the engagement between the engagement hole 9c and the elastic claw piece 2f, and each bracket 1 of the yoke plates 9, 9 is prevented.
, 2 in the circumferential direction and in the wing direction are prevented by the engagement of the projecting pieces 9a, 9a of each yoke plate 9, 9 with the engagement grooves 1e, 2e of each bracket 1, 2. Because of this, the structure is simple, and even when a pair of arc-shaped magnets 8, 8 are used as one permanent magnet, each yoke plate 9, 9 can be easily connected without providing cut-and-raised pieces on the thick yoke plates 9, 9. and the respective brackets 1 and 2, and the magnets 8,
8, the ends of the magnets can be positioned by the notches 1c, 2c provided in the annular protruding walls 11b, 2b of each bracket 1, 2, so that the magnets 8, 8 is attached at a predetermined position, it is possible to provide a micromotor that is easy to assemble and is inexpensive.

Furthermore, since the root portion of the elastic claw piece 2f is provided with support protrusions 2g, 2g that fit into the pair of notches 9d, 9d provided at the end of each yoke plate 9.9, the pair of notches 9. 9d,
A pair of brackets 1, 2 and a pair of arc-shaped permanent magnets 8, 8 are attached by pressing a pair of end pieces 9e, 9e formed between 9a to support protrusions 2g, 2g, respectively, by expanding them. , the pair of substantially C-shaped yoke plates 9, 9 can be integrally and firmly connected and fixed to each other, and in particular, the yoke plates 9°9
Even if the thickness of the plate is the same, the practical effects such as ease of assembly are great.

[Brief explanation of drawings]

The drawing shows an embodiment of a micromotor according to the present invention,
FIG. 1 is an exploded perspective view, FIG. 2 is an assembled sectional view, and FIG. 3 is an enlarged sectional view of the end of the yoke plate. 1.2... Bracket, 1b4b... Annular projecting wall, 8
．． 8... Permanent magnet, lc, 2c... Notch, 9,9
... Yoke plate, 9a, 9a... Projection piece, 1o, 2e
...Engagement groove, 9b, 9b...Fitting hole, If, i
f...Latching protrusion, 9c...Engagement hole, 2f...Elastic claw piece, 9dy9d...Cutting groove, 2g, 2g...Support protrusion, 9e, 9e...End piece.

Claims (1)

[Scope of utility model registration request] A row of resin brackets is each provided with an annular projecting wall, and a notch for positioning the end of a pair of arc-shaped permanent magnets is formed at opposing positions of each annular projecting wall, and a C-shape of a month is formed on the periphery of each bracket. Shape the engagement grooves of the protrusions provided on both ends of the mold yoke plate, and form a locking protrusion on the annular protrusion wall surface of the one bracket to fit into the fitting hole of each of the yoke plates. providing an annular projecting wall between the notches of the other bracket with elastic claw pieces that engage with the retaining holes of each of the yoke plates;
Further, the root part of the elastic claw piece is provided with a support protrusion that fits into a pair of grooves provided at the end of each of the yoke plates,
A micromotor characterized in that the pair of end pieces formed between the pair of grooves are expanded and pressed against the support protrusion.